What’s Vulnerable › Vulnerabilities

CVE-2020-37056: Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-30 · updated 2026-06-17
• Weakness: CWE-290

Description

Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and gain unauthorized access.

Affected products

• Crystal Shard http-protection: through 0.2.0

References

• https://github.com/rogeriozambon/http-protection
• https://www.exploit-db.com/exploits/48533
• https://www.vulncheck.com/advisories/crystal-shard-http-protection-ip-spoofing-bypass

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